An early and rare signed Rolex Cosmograph waterproof wristwatch with reference 6240. This early representation of Rolex chronograph watches is a timeless piece that collectors have admired for decades.

Water Proof Case - The 37mm to 40mm tonneau-shaped, water proof Oyster case is available in gold or stainless steel, and features a screw down back and screw down crown. The case, dial, movement are signed.

Screw Down Pushers - Ref 6240 is the first Cosmograph to feature screw down pushers, made of nickel coated brass with thin lines.

Unique Bezel - The black bezel of ref 6240 features a tachometer graduation to 200 units per hour. The bezel was initially made of black bakelite, but later models may have featured a metal bezel.

Dial - The dial of ref 6240 is available in an inverse combination of white and black. Steel square indexes and luminous dots are applied to the dial, along with luminous steel "baton" hands.

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Bob's Watches is an independent watch dealer and is not sponsored by, associated with and/or affiliated with Rolex, S.A. Bob's Watches only sells pre-owned Rolex watches and provides its own warranties on the watches it sells. Rolex, www.rolex.com, is under no obligation to warranty-service watches sold by Bob's Watches. Rolex Datejust, Rolex Day Date President, Submariner, Presidential, Explorer, Sea Dweller, Super President, GMT Master, GMT, YachtMaster, Prince, Milgauss, MasterPiece, Air King, Cosmograph Daytona, and PearlMaster are all registered trademarks of the Rolex Corporation ( Rolex USA, Rolex S.A.) To buy a new Rolex watch, please visit rolex.com for a list of authorized Rolex dealers near you.* Sales tax on Internet transactions is only collected on orders shipped to addresses in California or as otherwise required by law.